This adapter compatible for all type of no mic function earphone. If your earphone/headphone with Mic Function please check it is OMTP Standard Jack or CTIA Standard Jack as this adapter only suit for OMTP Standard Jack Earphone but not compatible for the CTIA Standard Jack Earphone. 3.5 mm Female to 2.5 mm Male Adapter provides stereo / mono functions to convert 3.5 mm audio. Your music keeps playing even during your toughest workouts. Connect your phone to your Hi-Fi System via a 3.5 mm Audio Cable. Enables your phone to use other 3.5 mm plug handsfree to listen to radio or MP3 (depends on your phone's compatibility).

Gold plated connectors resist corrosion and ensure optimum sound quality.
Note: the sound quality of this connector is ordinary. Please don't buy it if you have too high requirements for sound quality!